If you remember the old Argon days, we had quite rudimentary filters by today’s standards, the ffb was as raw as you could get back then. There has been advances in the electronics and base drive FW development since then, so it is not 100% directly comparable to 2014 OSW.
But still, running without any filter (especially in iRacing) is a pretty raw and rather noisy experience, people most likely think that the raw unfiltered or very low-filtered ffb is representative of real life, but it is a far cry from it, carefully applied filters though can approach real-life feel.
I’ve been doing a lot of testing vs my real-life Mustang with track-pack suspension and roll-bars, and how I am running my wheel now is closest to how the Mustang feels. To simulate road-noise and other effects, it is better to use shaker with a decent AMP, even a single shaker with a 100-150W amp will give a far better feedback of those effects that shouldn’t really be coming through the wheel-rim any way.
As for the wheel temperature filtered vs unfiltered, it should run cooler unfiltered, as with filtered, you always have some constant effects applied as a % of the max torque for your servo….